Correction of anisoplanatic phase errors in digital holography

Area of Science:

• Optics and Photonics
• Image Processing
• Wavefront Sensing

Background:

• Coherent imaging, including digital holography and heterodyne array data, is susceptible to phase errors.
• Existing algorithms primarily correct phase errors near the hologram plane.
• Phase errors introduced away from the hologram plane cause anisoplanatism, degrading image quality.

Purpose of the Study:

• To develop and demonstrate a method for correcting anisoplanatic phase errors in coherent imaging.
• To validate the propagation-based correction technique experimentally.

Main Methods:

• Propagating aberrated fields from the hologram plane to the plane of phase error introduction.
• Applying established phase-error correction algorithms in the identified plane.
• Utilizing digital holography or heterodyne array data for experimental validation.

Main Results:

• Successfully corrected anisoplanatic phase errors introduced at a distance from the hologram plane.
• Experimental results confirm the efficacy of the proposed propagation-based correction method.
• Improved image quality in coherent imaging systems affected by distant phase aberrations.

Conclusions:

• The propagation method effectively corrects anisoplanatic phase errors in coherent imaging.
• This technique offers a viable solution for enhancing image quality in digital holography and heterodyne array systems.
• The findings have implications for various applications requiring high-fidelity coherent imaging.